title: Picosecond and nanosecond pulse delivery through a hollow-core Negative Curvature Fiber for micro-machining applications.
abstract: We present high average power picosecond and nanosecond pulse delivery at 1030 nm and 1064 nm wavelengths respectively through a novel hollow-core Negative Curvature Fiber (NCF) for high-precision micro-machining applications. Picosecond pulses with an average power above 36 W and energies of 92 µJ, corresponding to a peak power density of 1.5 TWcm⁻² have been transmitted through the fiber without introducing any damage to the input and output fiber end-faces. High-energy nanosecond pulses (>1 mJ), which are ideal for micro-machining have been successfully delivered through the NCF with a coupling efficiency of 92%. Picosecond and nanosecond pulse delivery have been demonstrated in fiber-based laser micro-machining of fused silica, aluminum and titanium.
authors.forename: Piotr
authors.initials: P
authors.lastname: Jaworski
authors.forename: Fei
authors.initials: F
authors.lastname: Yu
authors.forename: Robert R J
authors.initials: RR
authors.lastname: Maier
authors.forename: William J
authors.initials: WJ
authors.lastname: Wadsworth
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Knight
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Shephard
authors.forename: Duncan P
authors.initials: DP
authors.lastname: Hand